Integrated: 8367231: [BACKOUT] JDK-8366363: MemBaseline accesses VMT without using lock

[Johan Sjölen]

This reverts commit ecfba66d3d7c1fef755f0824f342189d0f231007.

I broke the build because I didn't merge with master before integrating, let this be a lesson to me!

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Commit messages:
 - Revert "8366363: MemBaseline accesses VMT without using lock"

Changes: https://git.openjdk.org/jdk/pull/27164/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27164&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367231
  Stats: 228 lines in 12 files changed: 43 ins; 163 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/27164.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27164/head:pull/27164

PR: https://git.openjdk.org/jdk/pull/27164